The List

Herald of Leshrac

Flying
Cumulative upkeep—Gain control of a land you don't control. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Herald of Leshrac gets +1/+1 for each land you control but don't own.
When Herald of Leshrac leaves the battlefield, each player gains control of each land they own that you control.

Coldsnap

Flying
Cumulative upkeep—
Gain control of a land you don't control.
Herald of Leshrac gets +1/+1 for each land you control but don't own.
When Herald of Leshrac leaves play, each player gains control of each land he or she owns that you control.